Interplay of iron and rare-earth magnetic order in rare-earth iron pnictide superconductors under magnetic field
Yang Lei-Lei1, Liu Da-Yong1, †, , Chen Dong-Meng2, Zou Liang-Jian1, 3, ‡,
       

Dependence of the critical magnetic field of the spin-flop transition for Fe2+ ions on the interlayer coupling (a) and (b) in SmFeAsO under H ∥ a.